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JOSEPH F. CARROLL, OF SOUTH BOSTON, MASSACH s EYTT'S.`

Leners Patent No; 80,135, dated Juzg 21, 186s.

ARTISTS STRETGHING-FRAME.

TO ALL WHOM IT MAY CON-CERN:A

Be it known tnatI, AJoSEPiI F. CARROLL, of Sonth Boston, in the county of Suffolk, and State of Massachusetts, have invented a new -and improved Device for Spreading-Frames; andI do herebyr declare that thrci following is a full, clear, and' exact description thereof, which will enable those skilled inthe art to make and use the same, reference being had to the accompanying drawings, forming part of. this specification.

This invention relates to an improvement over all methods heretofore employed for spreading artists frames, and thereby stretching the canvas thereon and it consists in applying a right and left-hand screw to each of the corners of the frame, whereby the sides of the frame which are "thusoperated upon are moved` simultaneously, as will be hereinafter more fnlly'described;

The drawing represents the back side of an artsts frame (with 'canvas attached) provided. with my expanding-screws for spreading the frame and stretching the canvas, the view being partly in section, to show the screw, and the manner of its operation on the frame.-

A represents the frame, which may be halved or tenoned together at the corners in the ordinary manner.

B represents the canvas, which is nailed. to the frame, as usual.

My device for spreading the frame consists of two brackets and a screw for each corner,

The brackets' are marked C, and are securely fastened to the sides of' the frame. They are `drilled, and a screw-thread cut Ain each, a right-hand thread in one and a. left-hand thread in the other at eachcorner.

D is the screw, and the threads on its ends are cut to correspond withthe threads in the b`raekets,`so that when the screw is turned in one direction, the bracketswill be forced from each other, Vand when the screw is turned in thc other direction, the brackets will be drawn toward each other. d 4 i It will be seen that in the former-instance (and taking the sectional corner Atfor y anexample) the partsE and F of the frame'would be spread or expanded, 'and so with each corner in succession.

'lhe central portion of thel screws (between the threads) is' perforated with holes, as seen in the drawing,

for aordingfacilities for turning them with an awl or other suitablerinstrument or they may be left square,

so as to be tilrnedl with awrench erotherwise. v

These screws, being thus tted to the brackets, act asV braces and st'ien the-fraine, thereby greatlyv'adding to its durability and usefulness.

I claim as new, and desire to secure by Letters 'Patent-J- y Spreading or'expanding artists frames by a right and left-hand screw, substantially in the manner herein shown and described.

JOSEPH F. CARROLL.

Witnesses:

WM'. C. CULVER, H. Scnnorr. 

